Boring machine



Dec. 30, 1941.` J. IRTENKAUF BORING MACHINE s sheets-sheet 1 Filed Dec. 9, 1940 f ATTO'RNEY Dec. 30, 1941. J. IRTENKAUF 2,268,214

BORING MACHINE Filed Dec. V9, 1940 5 sheets-sheet 2 -lnvefor .JOSEF /RTVENKAUF O 7/ )l MIM ATTORNEY J. IRTENKAUF Dec. 3o, 1941.

Patented Dec. 36,1 941 UNITED sTptII-:sA PATENT OFFICE v2,268,214 l Bosma mennen Josef Irtenkanf, Gopplngen, WIn'ttembeI-g, Ger? many, assignor to Gebrder Bhl-Inger Ge mf b. H., Goppingem'wurttemberg, Germany 'Application December 9, 1940, serial No. 369,212 In Germany'November 24, 1939 6 Claims.

., In prior machines of this kind, the axis of the boring tool isr located directly above theirame beam and this-frame beam is open at its top and at its bottom to permit the Vchips cut out of the work piece to drop down through fthe framev into a receiving pan. Within the ira-me a feed spindle extends which cooperates with the tool support and serves the purpose to feed the tool into the revolving work piece. In order to prevent the chips from dropping directly on the r work spindle, "the tool support is normally provided with a sleeve covering and protecting the space'.' Anattempt lto reduce the height of the.`

40 the large chip receivingspace.

spindle. Such a sleeve, however, does not afford complete protection as it does not prevent the cutting liquid carrying dust and chips with it from soiling the spindle thus considerably in-2 creasing the wear thereof. The same. applies to the guide way which is subject to contamination by the cutting liquid and, hence, suiers from cxcessive wear. .These conditions considerably ai- .lect the accuracy of operation of the machine and reduce the life thereof:

"A iurther disadvantage of machines of thisV kind is the insuiliclency oi the space below the frame in which the chips dropping from the work piece may collect. ',Ihis space is limited, since the vheight oi' the machine measured from the lloor to the center line of the work spindle must `not exceed certain limits. Upon deduction from1 this height of the height o! the trame and the' distance oi theA work spindle center linetherefrom,- .but little is left, for the chip collecting produced within a short time as to completely fill and crowd the limited chip receiving space below the frame and to obstruct the passage way" of tl chips through-the frame thus causing the chips to collect above theirame.' ^Unless the chips are quickly removed. they will engage with the work piece and will be hurled away thereby thus endangering not only the operator of the machine but also other persons in the neighthe Aand will not bea contaminated thereby.

The chips accumulating below, thexwork holder and tool holder may be readily pushed -aside that If a. modem haraY bourhood. The removal of the chips offers considerable diiiiculties on account ol the poor accessibility of the passage way extending through the bed. Removing the chips without stopping the machine requires special labor.

The objects of my invention are to avoid the disadvantages o! the prior machine explained hereinabove and to facilitate the removal oi chips and to prevent them from collecting onl the frame and from coming `into contact with the feed spindle andthe guide ways oi the frame.

' To this end, I redesign the machine in such a way that its frame `vill be located laterally of the work spindle and of the tool thus leaving the the holders supporting the work and the tool unobstructed to receive the chips. Hence, a large space substantially coextensive with the length of the frame is available for receiving the chips. Moreover, the operator of the machine has an ideal access to the work and the tool to observe operation and to remove the iinished work piece` and to chuck a new one. This is a material expedites the operation. .I -Y While I may .provide the guide way lon top of the frame as in prior machines, I prefer to proplace where it will not be met by the chips and e the cutting -liquid dropping from thework piece Vby the operator and thus vbe distributed within moval of chips will oiler no difllculties even in event of a large output such as obtainable with hardmetal tools.

-Preferably, the beam constitutingv the frame of 's `the machine. is suPDOrtedby feet embracing a space which supplements the space below the tool axisin a valuable manner.

An important advantage of my invention re-V sides in the possibility oi giving the frame beam a hollow but `closed cross-sectional proille.

`Beams of this type have an excellent stillness against torsional stresses which is a multiple of the stiffness of the prior beams having an open profile. This is a very important feature since the :i5` torque exerted by the rotating workon the boring space belowthe tooland its support and 'below advantage' over the prior art, as' it facilitates and,

wayjmay be 'considerably increased compared with the prior design. Such increase. however,

lFig.1,

by a collarsurro tool is taken up by the frame beam and is transferred by the same to the head stock. It is.' therefore, highly desirable that the torsional stillness of the beam beincreased `to a maximum. This object is attained by giving the beam a closed profile. n the other hand, a given torsional stinnes`s may be attained with considerably thinnerl ily service the opposed instrumentalities of both machines, whereby the 'required labor ls considerably reduced. v

Two preferred embodiments ofmy invention are illustrated in the accompanying drawings in which Fig. 1 is an elevation of a simplex boring machine provided with a stationary boring tool.,

ig. 2 is a. plan view of the machine shownin IieL 1. f t

Fig. 3 is an end view shown from the left o Fig. 1 "f 4y is the section according to line 4 4 of Fig. 1.

i Fig. 5 is the sectiontaken along line 5-5 of Fig. 6 is a vsection similar to ythat of` Fig. l through a modified embodiment of the invention in which the boring tool is driven,

Fig. 7 is a perspective view of the machine shown in Figs. 1-5, and v Fig. 8 is a cross-section corresponding to Fig.

my invention.

.sol

the wel B. The holder la comprises a 'cenar 2| surrounding and guiding the working end of the boring tool Band supporting control members 22 lcontrolling the drive of the work spindle and controlling the slow cutting feed and the quick adjusting and returning feed of the toolsupport I8. Moreover, the slidable holder I9 is provided with a hand wheel 23 for its own manual adlustment and for that of the tool support I8.

The control members 22 are adapted to rotate splinedshafts 2t which are mounted one besidef the other on top of the beam I0 extending longitudinally thereof and being journalled in suitable y cantilever fashion, as will appear from Figs. 4

and 5, thus leaving the space below them and below the boring tool B unobstructed and free to receive a large quantity of chips which are cut out of the work piece W andv drop out ofthe hole that is bored into the same. This space is limited below by apan I1 attached to the legsoi the frame and extending between .the same and forwardly and rearwardly thereof. -Towards the front the chip receiving space is limited by a plate 25 readilydetachably iixed to the Aforward rim of the pan Il and extending .upwardly to a level slightly below the work spindle and the tool as will best appear from Figs. 5, 6 and 7.

The bed of the machine' comprises a y-hollow f box-shaped beam I0 having a completely closed cross-sectional profile. The top section and the bottom sectionof the front wall of `this beam constitute guide ways II and I2. Between these guide ways the front wall has a concave profile to accommodate the horizontal Afeed spindle I3 supported by suitable bearings on the frame.

The bottom wall I4 of the beam I0 is slightly inclined thus providing for a trapezoidal crosss section offering the advantage of a still highertorsional stillness than obtainable with a rec` sions it will readily accommodate the main driv- .ing motor and the gearing for operating .the work spindle and the pump feeding to the tool.

On the guideways II and .I2 the tool support I8- is slidably guided. In this tool support, the boring tool B is rigidly secured. Between the tool support lIll and thehead stock frame I5,

the cutting liquid The chip receiving space is supplemented by the spaces 2l between the feet I6. vTherefore, the operator may/ readily distribute the chips collecting below the-work W pushing them to the right and to the left and into the spaces2l. In this manner, the chips will not interfere with the proper operation oithe machine. l

Figs. 4 and 5 show clearly that the operator has a close access to the ,work piece and to the tool Vto survey the operation and to chuck and detach the work piece to and from the work spindle. In this regard, the invention. offers a considerable advantage over prior horizontal boring machines in which the tool spindle and the tool were mounted above the frame beam'. Also, the guide ways II and I2 may be -spaced ,apart a larger distance than in the prior ma- In Fig. 6 I have illustrateda modification of my invention in which the boring tool is driven.

' To this end, the tool support I I8 carries a driv. ing motor. 28 to which'current is supplied by la wiper 29 attached to the support H8 and sliding on -a live rail 30 mounted on the framebeam. This live rail is located in sheltered position on Athe back of the beam I0. Similarly, the feed spindle I3 and the guide ways lland I 2are located in a sheltered of the chips.

Fig. 8 illustrates aduplex machine in whichI the frame beam IIII carries two setsof working position outside of the range instrumentalities, one set on each side. Each there are mounted on the guide ways II, I2

.holders I9 and 20. The-holder N2li is constituted ing and supporting the end of the rotating ork piece W projecting towards set comprises `a tool support; a" tool holder I9, or IIs respectively, and a work holder surround'- ing and supporting-the work piece. TheY head stock is common to both sets of instrumentalities accommodating two work spindles. Hence, itl

will 'appear that the machine is fully symmetrically designed with regard to its central vertical 2,268,214 `longitudinal plane 3|. Inthis way', the capacity of the machine is doubled without duplicating the weight of the machine. For, the frame beam of the duplex machine is but little heavier than that of the simplex machine illustrated in Figs. 1 7.

While I have described my invention with reference` to specific embodiments thereof, I wish it to be understood that the invention is not limited to these embodiments but is capable of numerous modifications within the scope of the appended claims.

What Ihclaim is:

1. A boring machine comprising a frame constituting a horizontal guide way, a tool support movable thereon and extending laterally of said frame, a boring tool mounted on said support and extending parallel to said guide way laterally of said frame, said frame being provided with a head stock coaxial with said support and said boring tool and including a work spindle, and holders for supporting vsaid work and said boring tool slidably mounted on said guide way, the space below the work piece and the tool and laterally of the frame providing an unobstructed passage free of said frame through which the chips that form at thetool and work may pass.

2. A boring machine comprising a frame constituted by a horizontal beam having a lateral horizontal guide way, a tool support movable- 4. A boring machine comprising a framev constituted by a horizontal beam provided with a longitudinal guide way, a tool support and holders for supporting a work piece'and a boring tool being slidably mounted on said guide way and extending laterally from said beam in a cantilever fashion, said boring tool being mounted on said support and extending parallel to said beam, a head stock mounted on said beam coaxial with said tool support and said boring tool and including a work spindle carrying said work piece, said beam being provided with feet, the

, space below said Work piece and said tool and i stituted by a hollow box-shaped horizontal beam ing parallel tosaid guide way laterally of said beam, said frame being provided with a head stock coaxial with said support and said boring tool and including a work spindle, and holders,

tool support and holders for supporting a work piece and a boring tool being slidable on said guide way and extending laterally of said beam in a cantilever fashion, said boring tool being mounted on said support and extending parallel to said guide way laterally of said beam, and a head stock mounted on said frame coaxial with said support and said boring tool and including a work spindle carrying said work piece, the space Ibelow the work piece and the tool and laterally of the beam providing an unobstructed passage free of said beam through which the chips that form at the tool and work may pass.

having a concave side wall and being provided with a lateral horizontal guide way, a tool support and holders for supporting a work piece and a boring tool being` slidable on said guide way and extending laterally of said beam in a cantilever fashion, said boring tool being mounted on said support and extending parallel to said guide way laterally of said beam, a feed spindle journalled on said beam and extending within the hollow of said concave side wall and cooperating with said tool support, and a head stock mounted on said frame coaxial with'said support and said boring tool and including a work spindle carrying said work piece, the space below the work piece and the tool and laterally of the beam providing an unobstructed passage free of said beam through which the chips that form at the tool and work may pass.

6. A duplex boring machine comprising a horizontal beam provided with two longitudinal guide ways, two tool supports and two sets of holders on opposite sides of said beam, each tool support and set of holders being slidable on. one of said guide ways and extending laterally of said beam in a cantilever fashion, said holders of each set being adapted to support a work piece anda boring tool, the boring tools being mounted on said supports and extending parallel to said guide ways laterally of said beam, and two head stocks mounted on said frame coaxial with said supports and said boringA tools and including work spindles each carrying a work piece,

. structed passage free of said beam through which the chips that form at the tool and work may DRSS.

J OSEF IRTENKAUF. 

